<template>
    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header>
            <div>
                <img src="../assets/logo.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!-- 页面主体区域 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ? '64px' : '200px'">
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!-- 侧边栏菜单区域 -->
                <el-menu
                    background-color="#333744"
                    text-color="#fff"
                    active-text-color="#409EFF"
                    :unique-opened="true"
                    :collapse="isCollapse"
                    :collapse-transition="false"
                    :router="true"
                    :default-active="activePath"
                >
                    <!-- 一级菜单 -->
                    <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
                        <!-- 一级菜单的模板区域 -->
                        <template slot="title">
                            <!-- 图标 -->
                            <i :class="iconsObj[item.id]"></i>
                            <!-- 文本 -->
                            <span>{{item.authName}}</span>
                        </template>

                        <!-- 二级菜单 -->
                        <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                            <template slot="title">
                                <!-- 图标 -->
                                <i class="el-icon-menu"></i>
                                <!-- 文本 -->
                                <span>{{subItem.authName}}</span>
                            </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!-- 右侧内容主体 -->
            <el-main>
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
    data(){
        return {
            //左侧菜单数据
            menuList:[],
            iconsObj:{
                '125':'iconfont icon-haoyou',
                '103':'iconfont icon-quanxian',
                '101':'iconfont icon-shangpin',
                '102':'iconfont icon-dingdan',
                '145':'iconfont icon-shujutongji'
            },
            //是否折叠
            isCollapse:false,
            //被激活的链接地址
            activePath:''
        }
    },
    created(){
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods:{
        logout(){
            window.sessionStorage.clear();
            this.$router.push("/login")
        },
        //获取所有的菜单
        async getMenuList(){
            const { data : res } = await this.$http.get('menus')
            if(res.meta.status !== 200)return this.message.error(res.meta.msg)
            this.menuList = res.data
        },
        //点击按钮，切换菜单的折叠与展开
        toggleCollapse(){
            this.isCollapse = !this.isCollapse;
        },
        saveNavState(activePath){
            window.sessionStorage.setItem('activePath',activePath);
            this.activePath = activePath;
        }
    }
};
</script>

<style lang="less" scoped>
.home-container{
    height: 100%;
}
.el-header{
    background-color: #373D41;
    display: flex;
    justify-content: space-between;
    padding-left:0;
    align-items:center;
    color:#fff;
    font-size:20px;
    > div {
        display: flex;
        align-items: center;
        img{
            width:52px;
            height: 52px;
        }
        span {
            margin-left:15px;
        }
    }
}
.el-aside{
    background-color: #333744;
    .el-menu{
        border-right: none;
    }
}
.el-main{
    background-color: #EAEDF1;    
}
.iconfont{
    margin-right: 10px;
}

.toggle-button{
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color:#fff;
    text-align:center;
    letter-spacing:0.2em;
    cursor:pointer;
}
</style>